In prior Windows versions it was based on a file filter that watched changes for a certain set of file extensions, and then copied files before they were overwritten. This does not affect personal files such as documents, music, pictures, and videos. In Windows 10, System Restore is turned off by default and must be enabled by users in order to function. First included in Windows Me, it has been included in all following desktop versions of Windows released since, excluding Windows Server. System Restore is a feature in Microsoft Windows that allows the user to revert their computer's state (including system files, installed applications, Windows Registry, and system settings) to that of a previous point in time, which can be used to recover from system malfunctions or other problems. com /en-us /help /959063 /what-is-system-restore
